The comment comes after a NSW report released last year that recommended half a billion dollars be spent on shortening the trip between the two cities within five years.

Minister Berejiklian says the changes have taken two years to put in place since their election due to a decision to completely re-design the rail timetable.

"I would argue that we are not tweaking the timetable but we've actually thrown the old one out and started writing the new one from scratch which is why it takes two years," Ms Berejiklian said.

The changed timetable is also said to include additional services like some express and semi-express trains.

Despite the wait time on faster services, Berejiklian said that her government is satisfied with the progress being made.

"The Illawarra in particular has benefited from many of the announcements we have made in areas like the transport access program and areas like additional seats and services."

Ms Berejiklian has said in spite of the railway network, there are currently no plans to respond to community suggestions that a free green bus service be introduced to Shellharbour.

"We currently do not have plans to extend the existing shuttle services to other areas because the whole purpose of the shuttle services was supposed to be that it is in the CBD in Sydney, Newcastle and also in Wollongong.